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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fda445ff3eb4b69e0aeab31cecef45f23515f5927cd50967e81878ff44fae4e2' 
  AND token = 'o9Vx47Pszg/bSdB4sHsW1HxB8tuK49GoTnLuIx4gGDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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