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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f055d0bf8f22522aaaf01f7f453b81bba4fea295fc4b6c0b6b2b13f3bbe042e' 
  AND token = 'Z6mM3U1rSC7u/CriVlBd7br1oYHhfRZl6yKUQltzEyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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