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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30e9c6666c6ea9b66e2673c04055b9f9255f9c44aa82b38ec08375cb3c98b693' 
  AND token = 'e29fAK+OXc3iMRSI1A4PbJ4NGzK/VLjWRV5p6jn7A04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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