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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c7408c1039c865895250b36de468c0abd68c69996b5ccc907bd0d65de10cb07' 
  AND token = 'OicBLTMJpO13/AGz3ux0I0maZI8tq2IX8adFJ0izdU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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