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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82bf901b6e0e610075e96515ce12a3cd0ccb79bc6b43e2fbc75de74bac8d0ed3' 
  AND token = 'Ijz9Z8S6SR4ikvL479k1vNo03xmUJVH0G2GGZ6PDcUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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