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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8bccfeb15a2631f34d221f5e5e5419c222a1c4847cfe5ec1d920ee2f800d5c7' 
  AND token = 'VSGl7aEdXRSR2rRGNBhOTFfrn4MV2AeXHiUixrFJ52U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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