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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3fb9f88333d0576e60c0211e25afa6b38652aebfa3e83d8eae6955ce3bc2541' 
  AND token = 'qSNKcFRC3WPOlJtZsTwHcsvLNp1UCefyVJ9ryljsGY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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