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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03b67e49f675c7b4400d3ae41ae5ceb6b5e185b088502bdadfe34f781d5538b8' 
  AND token = 'bFUnIB0wu6nqCp42pJKtrhQvvqe5RgOtovxPEwtyJj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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