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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdfa1ca3b93087ce20a44e8a6f6b683c4ff3c609070d5f430e25ba7363364f4f' 
  AND token = 'JLr0/3m37novwXiDgRtt0YpFdO1xj6gBmAqlI6dGeW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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