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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '768677c9890abef689effef9fb3f3c7e97b7c2c07cc0a8cdcbf9dc8ee1c386a5' 
  AND token = '84sN2NUB50TVExxsSR5SWJgcou04m4hWmmwnfFl3Cvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}