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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '550243848d4d326d91cb9e734239aa76ce9543e405c3988a3e3c2aae8955ca26' 
  AND token = 'KIPGMbXEHim6PpYt1NeB9m/DMD6wbmILZl/n00SmZa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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