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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '989538633a5b4de899c9a7e6dabc120446bbb85ad6eb07012933908598ce2e9b' 
  AND token = 'RdTKr/2aDFmJU6ompWTUfi4XN5bU1YalHEKcEHgfaS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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