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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ef64937213768c2b32ef6c8ffd92b2e3107fc33300397445c463301ae2d4e7d' 
  AND token = 'KUjAhlSJMnOllGXt3CkqZdcbReMq/KbofJEILmCamho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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