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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9f44df91679d2d124d8ff7f78d1c4cb155070f6161a1f5710bdb0e52d83fa9a' 
  AND token = 'b/zKAVYYtKFx7q3VESbo3Pc1WDFR/+r9UEDhq9AQg6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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