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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '974674cd030069affde1453f5c9a4c57b3ade1369b8cd1d305b10daeae42ea8e' 
  AND token = 'TT+w0/9HjujplZXkFbDWqaX0yaqJwD4DueosbEyn0f8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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