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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75176930e3553769102c6b34b8435f6d860447561e81c59e0bc5063060b9a012' 
  AND token = 'Tt/Z3DYyvemesAEpzO5WdZJY9TT0yGHOTJ1OZr1QAx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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