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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56383214437e73f0d4a0f06387085bec657eed5cd703d85ff1c04f3279838aeb' 
  AND token = 'D5aaRdVdNePrwcx2tZKDjsAfTqMs9GUtuKv30HpsCyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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