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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '369e640d8ceef6a58fcff2a2fb1d7241401d91a3192945e9a850ae0bb9e9b4fd' 
  AND token = 'cJmU1bStwYMCSzFcuQRzo8f7XU6FomEb7IApqIDJjeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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