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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4b3c7ae5081dfe19028cf9a8f1e5436ba161457126636d826d12f7bc8e33ae0' 
  AND token = '3uw/2S8wNzy8peuXxGUaoGkQdcGFhELtVX5vOS9NKKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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