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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dd4cd60b71e3bcf31abfd2fae220c5ed99ee94464d85c5db015604621e2cfcf' 
  AND token = '2UeDKUmgmVdaTlomkAe/WblNtzJHUGvTlUvILHX8SbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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