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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f884a7c7ac5614ab450b5eb8967bc8e78ef86fb077df8bf2f380d09bfbde84b' 
  AND token = 'UBpAsojTDmk6JOXsq2gFmTypegWLDatZEQS6K7SPSKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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