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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f67fe3f7e8ad3247267c7c4603f199c9fbe46143c8dc4699872a3081d30ed95b' 
  AND token = 'MaibetFm0DRTT854lcroecv/SMg6Pb1m5R6k1JBkqGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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