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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac7b6d04120beaf43b3cd369c202e32a6af638ebf6aaa0c6edc706b8e41c9fd0' 
  AND token = 'ilIxQulAcAFLGi7reCcm5dznutFuaxp2gUqV5kWuWcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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