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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6c08f4ce6c4e70f7f7f8a12b1565c484746d31a4366d0230d31027beb519ade' 
  AND token = 'rCErMyhuv/Ww0Nxd3ss6oodO8PyzW20nh5tYQO4BOC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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