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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bbab590db0f90177488be0a5f2645b8422b3dda9bfc2f5a9cc646f91c8d87ce' 
  AND token = '4Mkt+5dtPkgeXI7tHJvie/GlTBYLZgpmAJTAfsVA6oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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