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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b1023aad90700c0afe5e8aa1599f14f2b8f3f0f962a8cc04e5c95cc3387f4d6' 
  AND token = 'gi8QwkJ8BJOPHEdPAX5qLQVP1eNit7HUaVIKxmTuoHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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