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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d25c1930b3391a17f7fc1a945f6cf8d6915f17f9488fc5e327d6bc0cbf7a9d1' 
  AND token = '7hd4CDXMaWujtQuj2pHbW9/PU7ufK4amqJ2Wmw82ISw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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