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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e8c85fb6c7a36c4c3c7f2a7f26c178757f8a9046d0f5cf72083b6222d893240' 
  AND token = 'UFbY+C44G05IIRO+bYSoFXG7Ti06izi05n2LyVdin7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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