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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b30cce339c150178e2e5bba7db48de109db13dcf6f4a0f08b6db54e4adfbcec5' 
  AND token = 'FOAN6F7+daCJCFm4UhgUGsavLqlJPHQR+r7F+EFVQEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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