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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9babd8ad65afb73dfc7d8732c5148b6a515596cb4cd41b10b39605ffa46140e' 
  AND token = '1tQRhMH8I4S0/Nz1FtPU6K3XjW5wZU6YCnbrwF4YXyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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