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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fffb161a7a0149a9c2e65c693aeaed34fab90cab3f6f13eaa40fcb30d236cc57' 
  AND token = 'VKqDGFOnuqODGHmw+lhab/rAPSyO5rn3c/hhvUM9vj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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