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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b231384d84ea3a8c94753e4386328316d4caa701ad3970d08cf8a3efb556d1' 
  AND token = 'tF/n//mLw2b8QsPZ9z5nPtvJEtfyZPqueejiPw6FhJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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