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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1197ed79415d0ca7b25c520e603cd235f030d3077c933bf44e692611df05e096' 
  AND token = 'kiDmdbgDdh+gaSY7YT0ZTF1mHv9KwCGAauEOxGuy5DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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