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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '408585c6bbce0b94c56aefb7f6353dfac38c7a74d3340c7c26dfdb1636a362db' 
  AND token = 'fkea6gl5PFsEd5/c/fZ/wHbxRwCjNMTneVC1hH/8bLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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