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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20587141301f889dffa6c0f107ca2eabc7e621fcc432e8f059e309a7c3fc394f' 
  AND token = 'jCggC2iwxkLxZbW9Rxa2pJ3PffYM2eRnX9mVTdQ3DVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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