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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71696f184d0857f4310eea18804b046c761318f8d286064f5f565eea6bfd33bc' 
  AND token = 'z86RrCIa5F/wScDgSY4pBbyXiVfJEo4ToiyNphtoy5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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