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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b323d474f5fe56d8b33fba34b336a1c657dfb5f29cf5463f6ac26068e08f79c' 
  AND token = 'dizdcMzOevQNqCYsAXxnVBEvclNuU7UkDUZmbq8ccaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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