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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9174f850f3de7a24e08403412ea495dfa5a6acbe9dffed9be1c5476b7f3a0cd8' 
  AND token = 'ohXf1YdvrMTdaGLykwwTTWYhAQI22ufXFUuYz9gWwqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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