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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '583b9c4ce0d0360080955fc424fa77dea6bb20a8004d16e51033f00c83cbfc1a' 
  AND token = 'GsZHItPmNCVpopCXoLw/GMerdmL+IlKX2WIHFLEgiUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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