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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c1249a86780dc5a77a62f790d22d08435e76a9ff233b4beaf0af2f263fc666' 
  AND token = 'Wy423HaydG35BQs087+wlaZxbXDFbmOOz+M6DIWGsaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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