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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa21cc4479f6901b3b355ae7602b4c8bb727ae71e66a82e29b5ab31a1767d874' 
  AND token = 'aDioxFfrUJsdq60HHknb6RV23HIt4g192lIS/QsT6yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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