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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68bbe8065144c0e7da012fac26723e9f195c7bd82aa7e9d4f1c060648af7aa36' 
  AND token = 'PYtYfNWGFxYu60DoE23MFpb0lXiYyYKn6q+1bZIuU4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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