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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2ff9bf7b586c01ebd19511de49e73e9e2ce5b4486ef37ec40d33cfc7046b707' 
  AND token = 'a1tDyCJaUimKtXI3+Sv1YXs4TXK4NcA2QPXdTdUi//A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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