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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6aeb45cce2fe290e6d2fde2e42e205d9b4da78786c05ad245f4b177b20dc9ae' 
  AND token = 'pQ/aI7KNuAICuj+SOFBc0a+dXV5a3C0dhM2+iDFjbAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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