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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '099720f9cf9585640f4510bda3ff3aade22a962d0bb27f0b9273b62409fb2eb4' 
  AND token = 'ZJLbt0P/dSCGzfVM927OUsrH5jsLZwBimPyjqaEfJdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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