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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beee64edf41e765425d5f45638e6737a3811223299a793927028dfc78805acc3' 
  AND token = 'm5s0q5q/YKs8fIqg3XYwIwn2l/DQDCi0xXiJ6l5Yk3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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