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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '879c7318bf32398f797e15c63dfcbd288f927ca35e404b4911328c9e4e592020' 
  AND token = 'Cy7gQ+Y+ObASxX0KAupEUAu07wuUYP7sXwDBOIPwBEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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