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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '471cc599e31aa152cc84f47ce4fa25a27b1e8ebfcf522d2c49a46cbb33604281' 
  AND token = 'GuYsp116y4JAiWTQgISVpsT6OdEL3rA1o89hhXBeb3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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