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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '747403e364e6b0d79dd0f07efb1c1ba32c78865c7a85acd22574bb8546cc627f' 
  AND token = '9fS4rMpS52vANk+DFD/Sl07AZhxE8hi+a4MZrQeuIaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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