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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86058c5fb3bccc52898fe34f4d413a7c28cda03ff8c86faab16e4e3925d3afc4' 
  AND token = 'tckqWNNW4tKOQp3eWPs/yDYIHMLUUt3fekCwQ02cWo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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