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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74593e21b27f118c08f32545903a411114ea1c45d23c31b023ba785c43948ec9' 
  AND token = 'GfiM0jnf06UMO6u1TlNk8Y0S704GIbwwV4MzSKRmOJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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