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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf3b4439223aadccbac1927ac7dac6e0a9ae24d33d06a70fc0733b4e063e7006' 
  AND token = 'FLGwNmWfS2g7BmhYGKIBRQrtOB0HgqT1nbvVKWNeh90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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