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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '737e26dd1d495358b73f5e6fc314c270c9e1a49a0aae7a19fc64f7432167561f' 
  AND token = '5m3VMjDO4tj7xOa/REM8nPwsrUofPpFc1Hw0UsIioMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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