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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfdfb86097b8d9a27a580d3886e71d671b9c1a430783cd3c3122867e2aed1a1a' 
  AND token = 'GB32Btdf87J7Z+J2dmpwzIFxFptNZubhaH5b8V6GJu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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