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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd4cb20d1dcfa14b893286a48cf13d290f6afa13acb7fd5ddcd45ee9a188fe14' 
  AND token = 'r4g7boiX9ayFNYX9I7jKZMSmrX0d63d+aP3g967dK7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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