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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcf929669f8c0b0d968799ee9da70133d639155f70dfc608bf4515df6a617633' 
  AND token = 'NUa2XvYGuD+BjMvtrJjjwT8papydF9IBCc3vJFqaByk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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